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<body>
  <script>
    const data = [
      { id: '01', name: '张大大', pid: '', job: '项目经理' },
      { id: '02', name: '小亮', pid: '01', job: '产品leader' },
      { id: '03', name: '小美', pid: '01', job: 'UIleader' },
      { id: '04', name: '老马', pid: '01', job: '技术leader' },
      { id: '05', name: '老王', pid: '01', job: '测试leader' },
      { id: '06', name: '老李', pid: '01', job: '运维leader' },
      { id: '07', name: '小丽', pid: '02', job: '产品经理' },
      { id: '08', name: '大光', pid: '02', job: '产品经理' },
      { id: '09', name: '小高', pid: '03', job: 'UI设计师' },
      { id: '10', name: '小刘', pid: '04', job: '前端工程师' },
      { id: '11', name: '小华', pid: '04', job: '后端工程师' },
      { id: '12', name: '小李', pid: '04', job: '后端工程师' },
      { id: '13', name: '小赵', pid: '05', job: '测试工程师' },
      { id: '14', name: '小强', pid: '05', job: '测试工程师' },
      { id: '15', name: '小涛', pid: '06', job: '运维工程师' }
    ]

    /**
     * 将平铺的数组结构转成树形结构
     * @param {*} list 需要转换的数据
     * @param {*} rootValue 顶级节点的 pid
     */

    function transTree(list, rootValue) {
      const treeData = []
      list.forEach(item => {
        if(item.pid === rootValue) {
          const children = transTree(list, item.id)
          if(children.length) {
            item.children = children
          }
          treeData.push(item)
        }
      })
      return treeData
    }

    // 1. 调用封装的 transTree，传递需要格式化的数据以及最顶级的 pid: '' 作为入口，开始进行遍历
    const treeData = transTree(data, '')
    console.log(treeData)

  </script>
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